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XAS study of U(1-y)PuyO2 solid solutions

Abstract : A new procedure for (U,Pu)O2 nuclear fuel manufacturing based on the oxalic co-precipitation of U(IV) and Pu(III) followed by the thermal conversion of the co-precipitate into oxide is under development. In order to fully investigate the ideality of solid solution with Pu content equal to 50, 30, 15 and 7 at.percent, XRD and XAS characterizations at uranium and plutonium LIII edges have been undertaken. Using XRD, a face centred cubic structure was observed in each case, and the cell parameter deduced obeys satisfactorily the Vegard-s law. However, EXAFS measurements moderate these results, only the (U0.5Pu0.5)O2 sample leads to the same conclusion as XRD. For the lower plutonium concentration, a disordered hyperstoichiometric structure (U1-yPuy)O2+x have been evidenced. In those compounds, cuboctahedral oxygen defects are only located around uranium atoms and not in the Pu environment. Thus, a much complex structure than suggested by the XRD is observed with certainly a non-random distribution of plutonium atoms into the uranium sites of the UO2+x structure
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https://hal-cea.archives-ouvertes.fr/cea-02356023
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Submitted on : Friday, November 8, 2019 - 3:15:03 PM
Last modification on : Wednesday, June 10, 2020 - 1:40:58 PM

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  • HAL Id : cea-02356023, version 1

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P. Martin, S. Grandjean, C. Valot, G. Carlot, M. Ripert, et al.. XAS study of U(1-y)PuyO2 solid solutions. Journal of Alloys and Compounds, Elsevier, 2006. ⟨cea-02356023⟩

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